Switch to use CodeMirror 3.0

  - Add trimmed down codemirror 3.0 package
  - Move elm specific changes from CodeMirror 2.13
  - Update editor css according to upgrade guide
  - Make compile script executable under unix/linux
  - Git ignore ghc output and Server executable
Add auto-compile option to editor
Add keyboard shortcut to compile using Ctrl+Enter
Tweak auto-compile timeout, re-add "default" theme option
Cleanup

  Removed unused files
  Rename haskell mode to elm
Merge pull request #16 from madscoaducom/auto-compile

Auto compile